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Leases - lease liabilities (Details) - USD ($)
$ in Thousands
Feb. 29, 2020
Dec. 01, 2019
Maturities of leases liabilities    
Balance of Fiscal 2020 $ 102  
Fiscal 2021 137  
Fiscal 2022 143  
Fiscal 2023 141  
Fiscal 2024 140  
Thereafter 269  
Total undiscounted payments 932  
Less: imputed interest (103)  
Present value of minimum lease payments $ 829 $ 858